Add sessions to HttpServer.

runtime/bin/crypto.h

Index: runtime/bin/crypto.h
diff --git a/runtime/bin/crypto.h b/runtime/bin/crypto.h
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+++ b/runtime/bin/crypto.h
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+// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+#ifndef BIN_CRYPTO_H_
+#define BIN_CRYPTO_H_
+
+#include "bin/builtin.h"
+#include "bin/utils.h"
+
+
+class Crypto {
+ public:
+  static bool GetRandomBytes(intptr_t count, uint8_t* buffer);
+
+ private:
+  DISALLOW_ALLOCATION();
+  DISALLOW_IMPLICIT_CONSTRUCTORS(Crypto);
+};
+
+#endif  // BIN_CRYPTO_H_
+